[Bug rtl-optimization/40838] gcc shouldn't assume that the stack is aligned

["mikulas at artax dot karlin dot mff dot cuni dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #39 from mikulas at artax dot karlin dot mff dot cuni dot cz  2009-09-20 06:30 -------
The updated patch fixes align-counterexample1.c, but not
align-counterexample2.c. Note that you must align the stack for all functions
that have some SSE operations, because you never know if the registers will be
spilled. The generated code is:

.globl f
        .type   f, @function
f:
        pxor    %xmm0, %xmm0
        subl    $28, %esp
        xorl    %eax, %eax
        .p2align 5,,24
.L2:
        movaps  %xmm0, p(%eax)
        addl    $16, %eax
        cmpl    $400, %eax
        jne     .L2
        movaps  %xmm0, (%esp)
        call    g
        movdqa  (%esp), %xmm0
        xorl    %eax, %eax
        .p2align 5,,24
.L3:
        movaps  %xmm0, q(%eax)
        addl    $16, %eax
        cmpl    $400, %eax
        jne     .L3
        addl    $28, %esp
        ret


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838